Vacuum pump



FIG. 1 is a perspective view of the vacuum pump, showing the new design;

FIG. 2 is a right side elevation view of the vacuum pump;

FIG. 3 is a left side elevation view of the vacuum pump;

FIG. 4 is a front elevation view of the vacuum pump;

FIG. 5 is a rear elevation view of the vacuum pump;

FIG. 6 is a top elevation view of the vacuum pump; and,

FIG. 7 is a bottom elevation view of the vacuum pump.

The broken lines in FIG. 7 are included for the purpose of illustration portions of the vacuum pump that form no part of the claimed design. 

The ornamental design for a vacuum pump unit, as shown and described. 